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单词 speed
释义 speed
[spēd]
GRAPHIC ARTS
The sensitivity of a photographic film, expressed according to one of several scales.
MECHANICS
The time rate of change of position of a body without regard to direction; in other words, the magnitude of the velocity vector.
OPTICS
1. The light-gathering power of a lens, expressed as the reciprocal of the f number.
2. The time that a camera shutter is open.
PHYSICS
In general, the rapidity with which a process takes place.
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